<!DOCTYPE html>
<html>
<head>
  <style>
    body {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      margin: 0;
    }
    
    .login-box {
      background: rgba(255,255,255,0.9);
      padding: 2rem;
      border-radius: 10px;
      box-shadow: 0 0 20px rgba(0,0,0,0.2);
    }
  </style>
</head>
<body>
  <div class="login-box">
    <!-- 登录表单内容 -->
  </div>
</body>
</html>
